What is the system?

What is the system?

The word system comes from the transliteration of the English system, That is, several parts are connected and interact with each other to form a whole with certain functions.

Qian Xuesen, a famous Chinese scholar, believes that a system is an organic whole with specific functions, which is composed of several interacting and interdependent components. This organic whole is also a component of the larger system to which it is subordinate. .

In the theory of digital signal processing, entities that can process and transform digital signals are called systems. Since a system that processes digital signals processes signals at a specified moment or sequence, this system is regarded as discrete time and can also be described using four methods: time-based language, tables, formulas, and waveforms.

In an abstract sense, both systems and signals can be viewed as sequences. However, the system is a mechanism for processing signals, which is different from signals. People study systems, design systems, and use systems to process signals and serve humanity. In addition to the four description methods above, other methods of describing the system include symbols, unit impulse responses, difference equations, and graphics.

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Computer system refers to computer hardware, software and network systems used for database management. Database systems require large-capacity main memory to store and run operating systems, database management system programs, applications, databases, directories, system buffers, etc., while auxiliary storage requires large-capacity direct access devices. In addition, the system should have strong network capabilities.

The characteristics of the computer system are that it can perform accurate and fast calculations and judgments, has good versatility, is easy to use, and can be connected into a network.

① Calculation: Almost all complex calculations can be realized by computers through arithmetic operations and logical operations.

②Judgment: Computers have the ability to distinguish different situations and choose different processes, so they can be used in management, control, confrontation, decision-making, reasoning and other fields.

③Storage: Computers can store huge amounts of information.

④Accuracy: As long as the word length is sufficient, the calculation accuracy is theoretically not limited.

⑤Fast:The time required for a computer operation has been as small as nanoseconds.

⑥General: Computers are programmable, and different programs can implement different applications.

⑦Easy to use: Rich high-performance software and intelligent human-machine interface greatly facilitate use.

⑧Networking: Multiple computer systems can transcend geographical boundaries and share remote information and software resources with the help of communication networks.

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